Tidy icon noise, URL strings, and null guards

src/components/Footer.astro

@@ -62,5 +62,6 @@ import TextLink from "@components/TextLink.astro";
 </footer>
 
 <script is:inline data-astro-rerun>
-  document.getElementById("footer-year").innerText = new Date().getFullYear();
+  const year = document.getElementById("footer-year");
+  if (year) year.innerText = new Date().getFullYear();
 </script>